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Old coal mines can be 'perfect' underground food farms - BBC News
Coal mining - encyclopedia article - Citizendium
India: Govt plans big push to pvt coal mining, underground coal
Boone Co. Mine Where Two Killed Had Bad Safety Reputation, Practiced
2.4 Economic Minerals – A Practical Guide to Introductory Geology
Coal mining | Britannica.com
Prasindo Consulting: Coal is mined by two methods – surface or
Schematic cross-section of a typical underground mine – Physical Geology
